Local cloning of two product states

Publication Type:
Journal Article
Citation:
Physical Review A - Atomic, Molecular, and Optical Physics, 2005, 72 (3)
Issue Date:
2005-09-01
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Local quantum operations and classical communication (LOCC) put considerable constraints on many quantum information processing tasks such as cloning and discrimination. Surprisingly, however, discrimination of any two pure states survives such constraints in some sense. We show that cloning is not that lucky; namely, probabilistic LOCC cloning of two product states is strictly less efficient than global cloning. We prove our result by giving explicitly the efficiency formula of local cloning of any two product states. © 2005 The American Physical Society.
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